Leffin, W. W. (1975). Going metric: Guidelines for the mathematics teacher, grades K-8. National Council of Teachers of Mathematics.
Citace podle Chicago (17th ed.)Leffin, Walter W. Going Metric: Guidelines for the Mathematics Teacher, Grades K-8. Reston, Va: National Council of Teachers of Mathematics, 1975.
Citace podle MLA (9th ed.)Leffin, Walter W. Going Metric: Guidelines for the Mathematics Teacher, Grades K-8. National Council of Teachers of Mathematics, 1975.
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